Facsimile and static presentation processing – Facsimile – Picture signal generator
Reexamination Certificate
1998-02-09
2001-06-12
Lee, Cheukfan (Department: 2722)
Facsimile and static presentation processing
Facsimile
Picture signal generator
C358S474000, C358S412000
Reexamination Certificate
active
06246492
ABSTRACT:
This invention relates to image scanner, facsimile and image printer—in particular to a reading head for such equipment.
The Flat Bed Image Scanner is widely used today as a periphery equipment for a computer. It can rapidly scan a document, a magazine, a book, a graph and a picture and input into a computer for processing. A flat bed scanner is composed of an optical reader, a driving mechanism, a processing circuit, a scanning window and a frame. Today, the trend is to make the scanner light-weight, thin, narrow and miniaturized. so it is desirable that the optical reading mechanism and the driving mechanism can occupy less space.
FIG. 1
shows a conventional technique. The components include a contact image sensor (CIS)
120
, a stepping motor
132
, a gear train
134
,
136
(only two gears shown for brevity), an idler
136
, a belt
130
for moving the CIS
120
and a guide rail (not shown).
The working principle of the image scanner is as follows: Referring to
FIG. 1
, a document to be scanned is placed on a glass window
110
. The contact image sensor
120
converts the image signal into digital signals, which are fed to an image processor (not shown) and then to a computer for further processing. When the CIS
120
reads a row of image signals, the driving mechanism moves the CIS
120
to another scanning successively until the complete image is scanned.
Structurally, the conventional technique has the driving mechanism, the stepping motor
132
and the gear train
134
,
136
, the idler
138
installed in fixed positions on the frame (not shown). The belt
130
is attached to the CIS
120
at a certain point, and moves the CIS in directions indicated by the arrowheads
140
. Such a structure occupies a great deal of space, and uses a great deal of material.
SUMMARY
An object of this invention is to reduce the size of a flat bed image scanner. Another object of this invention is to save material for the construction of the flat bed image scanner.
These object are achieved in this invention by combining the driving mechanism and the reading sensor in the same scanning module. A fixture is mounted on the frame of the scanner. When the driving mechanism exerts a force on the fixture, the reaction causes the movable module to glide back and forth along a track and to scan the image to be read. The force from the movable module can be exerted on the fixture through a rack and pinion mechanism between a gear and a grooved belt or a gear and a grooved frame The force can also be exerted through a wire or a ribbon fixed at two ends and wrapped around a wheel on the movable module.
REFERENCES:
patent: 4525748 (1985-06-01), Carbone
patent: 4965638 (1990-10-01), Hediger
patent: 5235353 (1993-08-01), Hirano et al.
patent: 5717503 (1998-02-01), Chien
patent: 5724159 (1998-03-01), Nakagawa et al.
patent: 5812172 (1998-09-01), Yamada
patent: 5857133 (1999-01-01), Sun
Chang Tony
Chen Michael
Avision Inc.
Lee Cheukfan
Lin H. C.
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